Design and Evaluation of a State‐Feedback Vibration Controller

Val, Ronald W. Du; Gregory, C.; Gupta, N. K.

doi:10.4050/jahs.29.30

Cited by 16 publications

(3 citation statements)

References 5 publications

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“…In [29], a state-feedback controller approach is presented for vibration reduction in contrast to controllers based on quasi-steady formulations (like Eq. 5 and its identification of unknown parameters).…”

Section: How It All Started: Hhcmentioning

confidence: 99%

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Active rotor control for helicopters: motivation and survey on higher harmonic control

Kessler¹

2011

CEAS Aeronaut J

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Since the early helicopter developments, these aircraft have made a tremendous progress in performance, handling qualities, comfort and efficiency. However, modern helicopters still suffer from many problems that hinder a further increase in their efficiency, acceptance and hence their market share. The high level of vibrations and the noise generated by the rotor are the most important reasons for this. While vibrations are a concern of pilot and passenger comfort, they also give rise to an increase in maintenance efforts and costs. The high noise level limits the acceptance of helicopters in the public, e.g. landing of helicopters on or close to hospitals during EMS missions. High noise levels also lead to an early aural detection during military missions. Further drawbacks of helicopters are the high fuel consumption in high speed forward flight due to the excessive power required, the limited speed of flight, the low range for the same reason, low lead-lag damping, etc. To alleviate these drawbacks of helicopters, active rotor control technologies have been investigated for a long time. Many different approaches have been investigated and most of them are not being followed any more. First investigations started with so-called Higher Harmonic Control (HHC) which has been replaced by Individual Blade Control (IBC). The paper gives a survey of the typical problems and explains the vibration and noise issues in more detail. Since active means have to compete with passive ones, such methods are also briefly addressed. Next, the paper gives a review on important HHC achievements. Due to space constraints, the paper mainly focuses on wind tunnel and flight test results. A second paper reviews IBC and gives an outlook on the idea of the swashplateless helicopter.

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Section: How It All Started: Hhcmentioning

confidence: 99%

“…Fig. 16 State feed-back vibration controller, x F , x R = fuselage and rotor states, z = filter states, C = feedback gain [29] Active rotor control for helicopters 13…”

Section: /Rev Couldmentioning

confidence: 99%

Active rotor control for helicopters: motivation and survey on higher harmonic control

Kessler¹

2011

CEAS Aeronaut J

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“…Very few studies have looked at using feedback control in helicopters [79][80] or on the stability of closed loop controllers [81]. Since the helicopter system equations are periodic, Floquet theory for the stability analysis of periodic systems needs to be used [82].…”

Section: Operational Issuesmentioning

confidence: 99%

Active Twist Control of Smart Helicopter Rotor - A Survey

Thakkar,

Ganguli

2023

joast

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Helicopter vibration and blade-vortex interaction (BVI) noise are major problems restricting the wider use of helicopters in civil and military applications. Traditional methods based on vibration isolators and absorbers and passive designs of the rotor blade to reduce BVI noise have reached the point of diminishing returns and are increasingly unable to meet the stringent requirements of next generation helicopters. The advent of smart materials such as piezoceramics, has opened the possibility of actively twisting the rotor blade using control algorithms in a manner such that new higher harmonic forcing is developed which cancels the existing unsteady higher harmonic aerodynamic forces that are the main sources of vibration and noise on the rotor. Since the main rotor of a helicopter is the principal source of vehicle vibration, active twist control offers possibility of a low vibration helicopter. This paper reviews the literature in active twist rotor control using smart materials.

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